Best Battery for my Mondial

Discussion in 'Mondial' started by AAmsden, Mar 16, 2018.

  1. AAmsden

    AAmsden Rookie

    Sep 24, 2017
    Studio City
    Full Name:
    Hi Guys,
    Is there any brand that I should look for? My batt is dead in my 89 Mondi and want to make a better choice than going down to AutoZone or Sears...
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  2. miketuason

    miketuason F1 World Champ
    Silver Subscribed Owner

    Feb 24, 2006
    Cerritos, CA.
    Full Name:
    Interstate Battery
  3. mulo rampante

    mulo rampante Formula Junior
    Silver Subscribed

    May 31, 2011
    Terra Incognita
    Full Name:
    I've had good success with dual-purpose marine batteries in my collector cars. These batteries strike a compromise between a starting battery (which can't endure many deep discharges) and a deep-cycle battery (which is more durable but doesn't produce the high current of a starting battery.) Another feature of these batteries is that they have an extra set of terminals -- in my case these are permanently attached to a cable and a connector, making battery tender connection a fast and trivial matter (I just plug the car in).

    You might also look into AGM batteries, these are also very durable, although your charger/maintainer should have a mode for charging these specially, as their charging regime is somewhat different from a traditional flooded lead-acid battery. Incidentally, AGM batteries are specified for use aboard aircraft as they can't leak significantly and can be operated in any position.

    Downside for both is these is cost... but I'm happy to use these as I typically get good life out of them in spite of the occasional deep discharge event. You should be able to get these at any marine supplier. They are offered in a variety of case sizes, and finding one that fit my QV was no problem.
  4. srephwed

    srephwed F1 Rookie
    Silver Subscribed

    Apr 29, 2012
    Full Name:
    fred brown
    I drove mine to the starter repair shop and I got the largest one I could fit in the hole. It is an exide super something or another. I think if I put it in high gear the starter would get the car to 50 mph.
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  5. Continental AutoSports


    Aug 22, 2006
    Hinsdale, IL
    Full Name:
    Parts Department
    For what it's worth, we use Interstate.
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  6. gsfent

    gsfent Formula 3

    Nov 16, 2009
    PB County, Florida
    Full Name:
    I generally use the correct group #, perhaps a little bigger if it fits.

    I like interstate too, but I do two things.

    First, if I haven't driven the car in a couple of weeks, I hook up the battery maintainer. I have it hard wired for a Schumacher battery tender. Takes about 10 seconds to plug in. I also have a cheap battery maintainer/charger from Harbor Freight which shows how much of a charge battery has and when it is at 100%. That one has typical alligator clamps. I have a positive post underhood and just ground it to the chassis. Usually takes less than 24 hours to top off.

    I also did the WR-1 Bosch relay to make starting easier. Car cranks like a champ since the relay is handling the electrical load, not the wiring.

    So starting has not been a problem.

    AAmsden likes this.
  7. moysiuan

    moysiuan Formula 3
    Silver Subscribed

    Nov 1, 2005
    Toronto, Canada
    Full Name:
    #7 moysiuan, Mar 20, 2018
    Last edited: Mar 20, 2018

    I have one of these Northstar AGM batteries in my Mondial. My old flooded lead batteries, typically Walmart performed fine, but by their nature they did surface corrode the battery tray over the years. So I cleaned that up, painted with some urethane chassis paint, and use an AGM so no more corrosion to think about.

    The fit was a tad big for the tray, so I used a small wood planer to shave a fraction off the plastic mounting protrusions you can see in the right lower side of the battery in the pic. I was surprised as the factory battery was a Euro group L3, which this Group 48 crosses to as well, but the side protrusions are solid plastic and no harm to the battery case for shaving a mm off.

    The height 188mm width 175mm and length 277mm is about the perfect fit (275mm length would be optimal I think), you can probably do a tad more height, but the length and width are as wide as you can go. I am not certain if the side protrusions are included in the length calculations specced by the manufacturer, I think they are. In any event, you can check against these dimensions any other battery choices to make sure they will fit. My car is a 1988 3.2 Swiss model, maybe the US battery trays were sized differently, but I am pretty sure all Mondials through the t series have the same battery specification.

    The Northstar one uses pure lead, so is more pricey than ones that use recycled lead or calcium alloys. AGM batteries are typically used on newer cars with start stop technology, and are overkill for our older cars. But if you want the best battery out there, with no leaks, this one is probably it. Price is not too bad for the long full warranty, and the likelihood of needing the warranty is probably lower based on what appears to be robust construction, although I have no data to compare.
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  8. JimboMondial

    JimboMondial Karting

    Dec 26, 2005
    Portsmouth UK
    Full Name:
    I fitted a optima Redtop 34R battery 2 years ago after having issues with the ABS black box sensing too big voltage drop and shutting down when starting and trickle charge it with a Ctek charger in AGM mode.

    Karsya Eins likes this.
  9. paulchua

    paulchua Cat Herder
    Moderator Owner

    Jul 1, 2013
    Menlo Park, CA
    Full Name:
    Paul Chua
    I got a yellowtop, it failed in a year switched to interstate still good after 2.

    Hope this helps
  10. Mondial 1985

    Mondial 1985 Formula Junior

    Jun 13, 2012
    Greenville, SC
    Full Name:
    Mark Alan Day
    Currently a yellow top with Deltran tender.
    paulchua likes this.
  11. paulchua

    paulchua Cat Herder
    Moderator Owner

    Jul 1, 2013
    Menlo Park, CA
    Full Name:
    Paul Chua
    just a note to all, don't take my individual poor experience as a full condemnation from Yellow Top - I have some friends that had good experiences such as this - I just had bad luck I guess.
  12. spicedriver

    spicedriver Formula 3

    Feb 1, 2011
    Just go to Walmart. They're pretty much all made by Johnson Controls these days. Batteries are going to fail every so many years. It helps if you throw a charger on it once a month.

    Off topic - I just picked up this really neat tool box there:

    Sears has the same one for $50 more. Although it does have a "CRAFTSMAN" sticker on it.
    moysiuan likes this.
  13. WilyB

    WilyB Formula 3
    Rossa Subscribed

    Feb 23, 2007
    I've been using an Optima yellow top for years. I parked my car in August, switch the battery off. Turned it back on a couple days ago, car started immediately.
  14. Ptggdudley

    Ptggdudley Rookie

    Mar 15, 2016
    Full Name:
    Mine came with a optima red top 5 years ago and had the factory digital clock disabled to eliminate draws by the previous owner. Has started evertime and I don't use a battery tender.

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